Air register for fuel burners



Sept. 14, 1943. R. M. HARDGROVE AIR REGISTER FOR FUEL BURNERS Filed July 25, 1940 INVENTOR. BY Ralph M Hqrdgrove ATTORNEY.

Patented Sept. 14, 1 943 e Am mers ieefeoe ev ee'eemefes registers nd the o eratingme'chemsm thereof. T em mobi v mv ntt vlsio'gi 'o f an improvedai'r regi te Construetwn Whifliis' cfieiqacterized by igs sign gs-ic eye can pr eonsbr'uetion, ease r operfiion, um teq ity of cqntr'ol of the register doors; and adapmom The various features of msveny Whieh n ma-- tagies a rid" pcifi "Objects attained it's" use ref eriic 's hoifl d' Behad t9 the aeeempenymg drawiingand descriptive matter "i which I ave 11- lustre'ted' arigif described a. preferre embodiment m. 1 1s a s emm al elevatiox i er .a, pulveeized fnei 'bhr'ne: hayin an air register, cdfistfrucjted 22 n view P i fi ier theeonstruction shown in Fi 1;--

Fig. 3 is an enlarged view of a'pe' cibfifei F il 2"s iibwi n'g the armo s-men open pesi ti on; end

Fig;

As s mmmem ve fi e ie iw n 1 pipe n avm a orizont y rrange me hr e source of pulverized fuel and primary ail-:1 The thebumer mpe t'z anaiis, dispersed b y'g li'e fmi 4 I.

is we -pro' for use in fuel b'urnerreg i ster s 6f x emt'wely large F1"; 4&5 a1 seetidn tak'nbn th line 44 of Qnn te casi r'i t'the bu'rh efpdrt and defines enemy mien assage 23 around t e discharge end at the'blfirnx" pipe. A circular jsrles of dbli'q'uely' positioned segmental secondary ah; vanes are ari'zihged' in the passage 23 V bet wee'n ffie bziriier pipe and a; fi u'stlc'i-ecznic{al-ring 25 fqrniing' 2i flarmg extension f the enter end 0f tl'iereffactbfy member H. The wines a-r'e' 'arrangedfor angular 32 "are ope etedby e. m chani m which ig u ee uniform pivfenal movement f e11 the qeer 6f ach- 81 m 35' is rigid1y sec qred miso cge's;

on the pivot studs 42 thereof. The relative arrangement of the shafts 35, plates 40, studs 42,

43 and tie bars 44 described provides a. linkage connection between adjacent airdoors forming in effect a jointed parallelogramptheshort' sides of which are the parallel lever arms between the As shown in corresponding studs on and the shaft connections of the plates 40. Each plate 40 thus isin effect;

a bell crank lever, the arms of which are sy m-. metrically arranged. As shown in the drawing; the lever arms of each bell crank lever are angu-- larly spaced'at an angle corresponding to that subtended by the chord extending between adjacent pivot axes 35. In operation, all of thetie bars are moved radially and parallel to their original positions; Thedescribed arrangement of the tiebars and stud pivots provides a more effective leverage on the air door shafts and minimizes the power requirements for actuating the assembly. By arranging altematetie bars on opposite sides of the bellcrank members 40, no interference oc curs therebetween'. A uniform angular movement of'each bell crank member 40 and the corresponding air door 32 can thus be effected.

As shown in Figs.,2 and 3 an operating shaft 50, actuated by a handle 5| moving across a quadrant .52, is mounted inthe outer side of the casing 2| at a point intermediate two of the bell crank members 40. The shaft 50 carries a crank arm 53 to whicha short link is pivotallyconnected. The opposite end of the link 54 is pivotally connected to an intermediate point on the middle tie bar M ofthe series. The handle 5i may be secured in any position relative to the quadrant 52 by a suitable spring-pressed lock mechanism.

When the fuel burner isto be put in operation the air register. operating handle 51 is moved from its closed position, shown in Fig. 2, towards the opposite end of the quadrant 52 to similarly move all of the air doors from the closed position shown in full lines towards the open position shown in broken lines in Fig. 2 The air register construction described, is particularly adapted for large size air registers, the specific construction illus,

trated being that used in an air registerof .42

inches diameter. Eight air doors are employed, four at each'side circumferentiallyof the operatinglshaftQ With the particular form of interconnection between the airdoors, all of the doors can be uniformly moved in thesameangular di-, rection relative to the circumference of theair register. can be used not only to control thequantity and velocity of the secondary air passing through the annular passage 23, but also to create a swirling:

movement of the entering air inacounter-clock- Wise direction, as shownin- Fig. 2. The air register construction is particularly useful where the. air entering the duct 20 has previously passed through a regenerative type air heater, as

deposition of dust in the door operating mechanism has little or no effect on theease'of operation, ,in contrast to the operating troubles encountered with air door operating mechanisms of the gear and circular jrack type under such Infthis manner the air doorposition of said bell crank member, and an operating legejri conditions. The mechanism is also advantageous in that only the usual manufacturing clearances are required in the pivotally connected parts, all lost motion being otherwise eliminated. The air register is adapted for use with gas and liquid fuel burners, as well as the pulverized fuel burner illustrated, and may be used with burners operating with an induced draft arrangement.

While in accordance-with the" provisions of the statutes I have illustrated and described herein the best form of the invention now known to me,

"those skilled in the art will understand that changes may be made in the form of the apparatus disclosed. without departing from the spirit said doors including bell crankmembers arrangedto actuate correspondingdoors, tie barsipivotally connecting cireumferentially adjacent bell crank.

members, adjacent tie bars. being 'connectidi in' angularly overlapping relation to spacedpivots on opposite sides of the samebell ,crank. 'mem bet and equiedistant radially from the pivot point formoving one of said the bars.

2. A fuel burner air register comprisingan an nular frame having air ports in the'circumferencethereof, pivoted doors controlling said ports, and means for simultaneously and vunifo'rinly.m'oving said doors including 7 bell crank; members farranged to actuate corresponding doors. tiebars pivotally connecting circumferentially adjacent bell crank members, adjacent tiebars being connected in angularly overlapping relation to space pivots on opposite sides of the. samefbell crank member and equi-distant radially from the pivot point of saidbell crank member andarranged to form in effect a jointed pa'ralleli'igram between the pivot points of circumferentially. adjacent doors, and an o erating .lev a n' dt 3 one ofsaidtiebars, 3. An air register "comprising an simmer frame having air ports in the. circumference. thereof,

pivoted doors controlling said ports, and means for simultaneouslytanduniformly moving said doors comprising means forming a 91' angm larly spaced lever ,arms forfmoving eachdoor.

tie bars pivotally. connecting the lev'er arms,

circumferentially adjacent doors, andeach of lever arms being spacedat an angle cor're-Q spending to the angle subtended by the chord extending between thejpivot axes of circumferentially adjacentdoor's. I

saiddoors compnsinggmeans mangle; pairgor I angularly spaced, lever arms. ror moving each door, tie bars pivotally connecting thelever' arms of circumferentially adjacentjdoors";eachtie bar and it's lever arm connecflpnsbeing 'arransearet ative to the corresponding "dOOrT pivot. ax sto' provide, a perpendicular. position Iof tief bar relative to itsleve'r arm connections at .its point of midtravel', and anv operating lever for" moving one ofsaid tiebars.

5. An air register comprising frame.

comprising-an having air ports in the circumference thereof, pivoted doors controlling said ports, and means relation with each pair of angularly spaced lever arms on the corresponding door pivot axis, and an operating lever for moving one of said tie bars.

6. A fuel, burner air register comprising an annular frame having air ports in the circumference thereof, pivoted doors controlling said ports, and

means for simultaneously and uniformly moving said doors comprising means forming a pair of angularly spaced lever arms for moving each door, tie bars pivotally connecting the lever arms of circumferentially adjacent doors, adjacent tie bars being connected in angularly overlapping relation with each pair of angularly spaced lever arms and the tie bars and lever arm connections being arranged relative to the corresponding door pivot axes to insure a perpendicular position of each tie bar relative to its lever arm connections at its point of midtravel, and an operating lever for moving one of said tie bars.

RALPH M. HARDGROVE.

CERTIFICATE OF CORRECTION. Patent No. 2,529,L 6s. September 11;, 19L 5.

RALPH M. HARDGROVE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, sec- 0nd column, line 68, claim 1;, beginning with each strike out all to and including the word "midtravel" in line 75, and insert instead the following each pair of lever arms being spaced at an angle corresponding to the angle subtended by the chord extending between the pivot axes of\ circumferentially adjacent doors and that the said Letters Patent sh'ould be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day er June, A. D. 19%.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

